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General Resources:
General Resources:
Video Lectures - Wave Interference
Kognity Textbook Chap 4 - Use you ACS Login
IB Physics Site: Topic 4 - Comprehensive notes
IB Physics Site: Topic 4 - More notes
Topic 4 Flashcards - Vocab Devo.
The principle of superposition states that the net displacement of the underlying medium for a wave is equal to the sum of the individual wave displacements.
Desmos Waves - Creating models of wave interference.
Gravitational Waves and Superposition - Interferometers - the ACTUAL DATA!!!! - LIGO/VIRGO
3D Interference Patterns.
3D Interference Patterns.
Describe how the sound intensity varies as you move through the room from point P to point Q.
Path Difference:
Beats
Beats
Calculating Beat Frequencies:
Calculating Beat Frequencies:
When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats.
Beat Amplitudes and Energy
Fixed-end Reflection, creates an inverted pulse (amplitude).
Free-End Reflection - creates an upright pulse (amplitude).
If the wavelength of the wave 'fits' on the string (or within the tube), an interference pattern is established and areas of constructive and destructive interference appear.
As we will see in 04.5 Standing Waves, this phenomena is the basis for most (if not all) musical instruments.
Noise Cancelling Headphones
Noise Cancelling Headphones
Rogue Waves
Rogue Waves
Discovering Gravitational Waves
Discovering Gravitational Waves
Possible Questions/Problems
Possible Questions/Problems
Waves emitted from sources X and Y have equal wavelengths and are initially in phase. The waves interfere destructively at point P, where the path difference is 0.90 m.
What is a possible value for the wavelength of the waves?
A. 0.20 m
B. 0.30 m
C. 0.40 m
D. 0.60 m
Two loudspeakers, S1 and S2, each emit a musical note of frequency 2.5 kHz with identical signal amplitude. Point P lies on the line AB and is equidistant from S1 and S2. The speakers are placed 1.5 m apart from each other and 8.0 m from line AB. The speed of sound is 330 m/s.
A person walking in a straight line from A to B observes that the intensity of sound alternates between high and low.
With reference to interference, explain why the intensity of sound alternates along line AB. [3]
From 04.4 - Diffraction
The sound has a maximum intensity at P. Calculate the distance along line AB to the next intensity maximum when S1 and S2 emit a musical note of frequency 2.5 kHz. [2]
S1 and S2 are moved so that they are now 3.0 m apart. They remain at the same distance from line AB. Discuss the changes, if any, in the rate at which the intensity of sound alternates when a person is walking along line AB at half the speed. [2]
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